I collect a lot of stuff on my Mac. I don't even know what this hummer is for?

Do I need it? May I delete it and not cause any ill effects on my iMac 24 inch.

From XQuartz :

The Xquartz project is an open-source effort to develop a version of the X.org X Window System that runs on Mac OS X. Together with supporting libraries and applications, it forms the X11.app that Apple has shipped with OS X since version 10.5.

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